Case Environmental
Case Environmental

Chlorination Certificates & Disinfection

Case Environmental is a south west-based national chlorination contractor providing water chlorination (often incorrectly termed 'chlorification'), sterilisation, disinfection and UKAS sampling services across the whole of the UK - call 01626 249 042 to discuss your requirements.  Our chlorinators hold current EUSR National Water Hygiene Cards and WIAPS certification that can be produced upon request.  For further information or a quote please email or complete the form below.


Chlorination process

  1. Flush/swab pipe work/tank/reservoir and record background chlorine residual.
  2. Introduction of 50ppm (mg/l) chlorine solution.
  3. Allow high level chlorine to sit in contact for 1 hour.
  4. Flush pipe work until recorded background chlorine level is reached, de-chlorinating water as necessary.  Test & record onsite parameters.
  5. If collecting a UKAS microbiological sample, allow to sit for a further 30 minutes prior to sample collection.

Chlorination Certificate  Disinfection by chlorination is often a contract requirement for new internal plumbing services prior to handover.  A chlorination certificate may also be needed for new 'over-sized' water pipes prior to a new water connection; before connection to mains pipe work the water company will need to see a chlorination certificate (to British Standards BS6700, BS EN 806 or BS8558) and if needed, the satisfactory sample results of a UKAS certified microbiology test.


Where needed a chlorination certificate can be provided on the same day.  An example of a chlorination certificate is provided at the bottom of the page.


Chlorination equipment  Case Environmental uses chlorine dosing equipment to ensure a precise chlorine residual throughout the length of the water pipe.  Onsite chlorine levels are electronically measured using a photometer and microbiological samples (where needed) are tested in an UKAS laboratory.  All materials, products and chemicals used are approved for use in contact with drinking water.  This includes low bromate sodium hypochlorite.


Why is chlorination required?  The chlorination process (and if needed, microbiological testing) ensures and demonstrates that the pipe work is hygienic and the water is free from contamination.  Chlorination is important for newly installed pipe work or existing plumbing systems that have been out of use.


Why Case Environmental?  Case Environmental is a business run by Andrew Case, an experienced, qualified water quality scientist with over 16 years experience in the water and environment industry.  Case Environmental use accurate chlorination equipment and offer a complete and thorough understanding of the regulations and how they apply in your circumstances.


Chlorination advice  We will happily provide no-obligation free chlorination and disinfection advice - please contact us to informally discuss your site requirements for a prompt estimate.


Last Minute/Same Day Chlorination Certificate?  If you need a last minute, same day chlorination certificate, please give us a call to see if we can help.


Chlorination after prolonged period of non-use

The HSE document; Legionnaires’ disease Part 2: The control of legionella bacteria in hot and cold water systems details the actions to take when recommissioning plumbing systems taken out-of-use (and not regularly flushed).  Specifically, paragraph 2.52 on page 24 states that prior to ue the system should be treated as a new installation and cleaned, flushed and disinfected;


As well as commercial buildings, this should also be considered for domestic properties such as those that have been unoccupied for a prolonged period prior to new owners/tenants.


Chlorination/disinfection/sterilisation/flushing services can also be provided for the following;

  • Tank chlorination
  • Office, Shop, restaurant and cafe shopfitting
  • Rental properties
  • Holiday park chlorination
  • Hotel chlorination
  • New domestic plumbing installations on new builds
  • New mains chlorination
  • Emergency chlorination
  • Commissioning of new buildings (frequent contract requirement)
  • Private water to mains conversions
  • Post major building extensions and alterations
  • After bacterial contamination
  • Legionella - disinfection to HSE ACOP L8 (Legionnaires' disease. The control of legionella bacteria in water systems)
  • Facilities management
  • Water system hygiene management
  • Systems not in regular use or flushed
  • Annual or routine system maintenance

Water company chlorination requirements and guidance;

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Locations covered by Case Environmental include (but are not limited to);


Bedfordshire, Berkshire, Bristol, Buckinghamshire, Cambridgeshire, Cheshire, City of London, Cornwall, Cumbria, Derbyshire, Devon, Dorset, County Durham, East Riding of Yorkshire, East Sussex, Essex, Gloucestershire, Greater London, Greater Manchester, Hampshire, Herefordshire, Hertfordshire, Isle of Wight, Kent, Lancashire, Leicestershire, Lincolnshire, Merseyside, Norfolk, North Yorkshire, Northamptonshire, Northumberland, Nottinghamshire, Oxfordshire, Rutland, Shropshire, Somerset, South Yorkshire, Staffordshire, Suffolk, Surrey, Tyne and Wear, Warwickshire, West Midlands, West Sussex, West Yorkshire, Wiltshire, Worcestershire, Bath, Birmingham, Bradford, Brighton & Hove, Bristol, Carlisle, Cambridge, Canterbury, Chester, Chichester, Coventry, Derby, Durham, Ely, Exeter, Gloucester, Hereford, Kingston-upon-Hull, Lancaster, Leeds, Leicester, Lichfield, Lincoln, Liverpool, London, Manchester, Newcastle-upon-Tyne, Norwich, Nottingham, Oxford, Peterborough, Plymouth, Portsmouth, Preston, Ripon, Salford, Salisbury, Sheffield, Southampton, St Albans, Stoke-on-Trent, Sunderland, Truro, Wakefield, Wells, Westminster, Winchester, Wolverhampton, Worcester and York.



Blaenau Gwent, Bridgend, Caerphilly, Cardiff, Carmarthenshire, Ceredigion, Conwy, Denbighshire, Flintshire, Gwynedd, Isle of Anglesey, Merthyr Tydfil, Monmouthshire, Neath Port Talbot, Newport, Pembrokeshire, Powys, Rhondda Cynon Taff, Swansea, Torfaen, Vale of Glamorgan, Wrexham, Bangor, Cardiff, Newport, St Davids and Swansea.



Ayrshire, Dumfries and Galloway, Edinburgh and The Lothians, Glasgow and Clyde Valley and The Borders.


London Boroughs

Barking and Dagenham, Barnet, Bexley, Brent, Bromley, Camden, City of London, Croydon, Ealing, Enfield, Greenwich, Hackney, Hammersmith and Fulham, Haringey, Harrow, Havering, Hillingdon, Hounslow, Islington, Kensington and Chelsea, Kingston upon Thames, Lambeth, Lewisham, Merton, Newham, Redbridge, Richmond upon Thames, Southwark, Sutton, Tower Hamlets, Waltham Forest, Wandsworth and Westminster.


Water Companies

Affinity Water, Albion Water, Anglian Water, Bournemouth Water, Bristol Water, Cambridge Water Company, Cholderton and District Water Company, Dee Valley Water, Dŵr Cymru Welsh Water, Essex and Suffolk Water, Hartlepool Water, Northumbrian Water, Portsmouth Water, Severn Trent Water, South East Water, Southern Water, South Staffordshire Water, South West Water, Sutton and East Surrey Water, Thames Water, United Utilities, Wessex Water, Yorkshire Water and Youlgrave Waterworks.

Example Chlorination/Disinfection Certificate PDF
Example Chlorination Certificate.pdf
Adobe Acrobat document [270.8 KB]
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